3111212121209 has 2 divisors, whose sum is σ = 3111212121210. Its totient is φ = 3111212121208.

The previous prime is 3111212121191. The next prime is 3111212121247. The reversal of 3111212121209 is 9021212121113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2464281458809 + 646930662400 = 1569803^2 + 804320^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111212121209 - 2⁸ = 3111212120953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3111212121299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1555606060604 + 1555606060605.

It is an arithmetic number, because the mean of its divisors is an integer number (1555606060605).

Almost surely, 2^{3111212121209} is an apocalyptic number.

It is an amenable number.

3111212121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3111212121209 is an equidigital number, since it uses as much as digits as its factorization.

3111212121209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 3111212121209 in words is "three trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred nine".